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Multiple beams at low frequency
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16 elements acoustic airgun amplitude detector length analytic signal angle aperture array processor beam amplitude beam signal beamforming beamwidth bottom echo bundels calculated central beam coherent detector length contour chart contour diagram contourstripchart dcos B1 density depth direction Discrete Fourier Transform div grad Doppler echosounders elements array length experiment Fast Fourier Transform Fourier Transform hardware horizontal host-computer hydrophone Hz velocity input layer length 8 taper lock chamber Maasbracht major lobe matched filter maximum measurement memory modulated beam multi-beam echosounder multi-beam system MULTIPLE BEAM ocean on-line output parameters phase-shifts plane processing projector quadrature detection receiver elements reflection coefficient reflector sensitivity contour diagram shading shot side-echoes sidelobe sidelobe level signal-to-noise ratio simple Taylor weighting sonar sound source sound velocity steering phase streamer signal Taylor weighting factor towed transducer Tydeman water surface wave wavelength weighting factor 330 weighting function